diff --git a/cis/private/tools/notebook_registration.php b/cis/private/tools/notebook_registration.php
index b5704b572..05faf11be 100644
--- a/cis/private/tools/notebook_registration.php
+++ b/cis/private/tools/notebook_registration.php
@@ -38,7 +38,7 @@ else
 
 function ip_increment($ip = "")
 {
-	$ip = split("\.", $ip);
+	$ip = explode(".", $ip);
 
 	if($ip[3] > 0 && $ip[3] < 254)
 	{